(Inside Science) — Just a few weeks ago, two large wildfires caused massive destruction and at least 91 deaths in California, the Woolsey fire near Los Angeles and the Camp fire that engulfed the town of Paradise in the north. Residents and firefighters struggled to stop both fires, yet they can expect more like them to come.

Simultaneous large fires are becoming more common throughout the continental United States, according to new research presented by Alison Cullen today at the Societ